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<title>jQuery.fn.extend(object)</title>
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  <div rel="jQuery.fn.extend">
    <h2><span>返回值:jQuery</span>jQuery.fn.extend(object)</h2>
    <h3>概述</h3>
    <div class="desc">
      <p>扩展 jQuery 元素集来提供新的方法（通常用来制作插件）。</p>
      <div class="longdesc">
        <p>查看这里&lt;a href="http://docs.jquery.com/Plugins/Authoring" title="Plugins/Authoring"&gt;Plugins/Authoring&lt;/a&gt;可以获取更多信息。</p>
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    <h3>参数</h3>
    <div>
      <h4><strong>object</strong><span>Object</span><em>V1.0</em></h4>
      <p>用来扩充 jQuery 对象。</p>
    </div>
    <div class="example">
      <h3>示例</h3>
      <span id="f_ad2"></span>
      <h4>描述:</h4>
      <p>增加两个插件方法。</p>
      <h5>jQuery 代码:</h5>
      <pre><code>jQuery.fn.extend({
  check: function() {
    return this.each(function() { this.checked = true; });
  },
  uncheck: function() {
    return this.each(function() { this.checked = false; });
  }
});</code></pre>
      <h5>结果:</h5>
      <pre><code>$("input[type=checkbox]").check();
$("input[type=radio]").uncheck();</code></pre>
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